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View article: Rate-Dependent Tensile Behavior of Glass Fiber Composites Reinforced with Quadriaxial Fabrics, with or Without Coremat Xi3 Interlayer, for Marine Applications
Rate-Dependent Tensile Behavior of Glass Fiber Composites Reinforced with Quadriaxial Fabrics, with or Without Coremat Xi3 Interlayer, for Marine Applications Open
This study is among the first to characterize the tensile response of composites with quadriaxial glass fiber fabrics designed for marine structural applications. Four composite configurations were fabricated at laboratory scale, combining…
View article: The Role of Standards in Teaching How to Design Machine Elements
The Role of Standards in Teaching How to Design Machine Elements Open
This paper introduces arguments in favor of the intensive use of standards in both teaching the Machine Elements discipline and solving the first projects of mechanical design (gearboxes, jacks, pumps, tanks, etc.). The paper presents a SW…
View article: Effect of Coremat Xi 3 Middle Layer on Flexural Performance of Glass Fibre Composites under Different Test Rates
Effect of Coremat Xi 3 Middle Layer on Flexural Performance of Glass Fibre Composites under Different Test Rates Open
This study presents experimental results from three-point bending tests conducted on two composite types reinforced with quadriaxial glass fibre fabrics, both using unsaturated polyester resin as matrix, and differing by the presence or ab…
View article: Aspects of Ballistic Panels Made of Endumax XF33, Tested Against Different Projectiles
Aspects of Ballistic Panels Made of Endumax XF33, Tested Against Different Projectiles Open
This paper presents an experimental study for hard plates made of Endumax XF33– a UHMWPE ultra high molecular weight polyethylene. There are tested two plates with 68 layers and 135 layers, respectively. The objective of this research was …
View article: Aspects of Ballistic Panels Made of Unidirectional Aramid Fabrics, Tested Against 9 mm FMJ Projectile
Aspects of Ballistic Panels Made of Unidirectional Aramid Fabrics, Tested Against 9 mm FMJ Projectile Open
This paper presents aspects of designing personal armors against ballistic attacks. The study presents tests on relatively new materials on the protective system market. There are pointed out aspects of experimental results. This type of s…
View article: SEM Investigation of Failure Mechanisms in Twaron® Aramid Fibers Used for Personal Armors
SEM Investigation of Failure Mechanisms in Twaron® Aramid Fibers Used for Personal Armors Open
This paper presents a synthesis of failures of aramid fibers used in protective systems, with the help of SEM images obtained from three types of samples (panels made of fabrics with aramid fibers) tested against bullets, knives and spikes…
View article: Influence of Resin Grade and Mat on Low-Velocity Impact on Composite Applicable in Shipbuilding
Influence of Resin Grade and Mat on Low-Velocity Impact on Composite Applicable in Shipbuilding Open
In this study, the composition and mechanical properties of composites designed for shipbuilding are described. Four different composites were designed and fabricated by the research team, using quadriaxial glass fiber fabric (eight layers…
View article: An analysis of water from Prut river near Cahul City
An analysis of water from Prut river near Cahul City Open
Prut river has particular evolutions of its characteristics due to its geographical and political position (as border river between Romania and Moldova), specific climate and human activities (agriculture and industry). The dependences of …
View article: Micro UAVs with Fixed Wings: Design, Technological Solutions, and Tests
Micro UAVs with Fixed Wings: Design, Technological Solutions, and Tests Open
Considering the advantages of using expanded polystyrene (EPS) reinforced with adhesive tape made of glass fibers, this paper presents a design and technological solution for a functional drone of class C1, meaning a maximum take-off mass …
View article: Polymeric Composites: Failures in Dry Sliding on Steel
Polymeric Composites: Failures in Dry Sliding on Steel Open
The investigation of a tribosystem failure is important in establishing its causes with the highest probability. This paper proposes a discussion on particular aspects of failure in polymeric composites sliding against steel in dry regime.…
View article: Standardization in Tribology
Standardization in Tribology Open
This paper presents an analysis of standards applied in tribology, especially concerning materials, test methods and failures of machine components, related to exploitation under load and motion. By the help of their own research and based…
View article: Behavior of Composites Made of Quadriaxial Glass Fiber Fabrics and Epoxy Resin under Three-Point Bending
Behavior of Composites Made of Quadriaxial Glass Fiber Fabrics and Epoxy Resin under Three-Point Bending Open
This paper presents experimental results from three-point bending tests for a composite made of quadriaxial glass fiber fabrics and an epoxy resin. Two composites were tested, one with 8 layers and the other with 16 layers; both had the sa…
View article: Experimental Study of Twaron T730 for Two Threats
Experimental Study of Twaron T730 for Two Threats Open
This paper presents the result of impact tests with two threats on panels made of Twaron® fabrics T730. Test were done with special equipment, such as firing bench, used for ballistic testing personal protective equipment. There were teste…
View article: Panels Made of Composite Coated Aramid Fabrics, Under Spike Weapon Attack
Panels Made of Composite Coated Aramid Fabrics, Under Spike Weapon Attack Open
This paper presents the results of puncture tests on panels made of Twaron® fabrics SRM509. Tests were done with the help of the Instron 9340 drop-test machine for evaluating the influence of the number of layers and the striking energy le…
View article: The Behaviour of Stratified Fabrics of Aramid Fibres under Stabbing Conditions
The Behaviour of Stratified Fabrics of Aramid Fibres under Stabbing Conditions Open
This paper presents research on several factors influencing the stabbing behaviour of stratified panels made of aramid fabric Twaron® SRM509 Teijin Aramid BV (Arnhem, The Netherlands). The inputs in the test campaign were the number of lay…
View article: Influence of Sliding Speed and Glass Bead Concentration on 3D Roughness Parameters
Influence of Sliding Speed and Glass Bead Concentration on 3D Roughness Parameters Open
This paper presents an analysis of 3D amplitude and functional parameters for worn surfaces of composites with polyamide 6 as matrix and different glass bead concentrations (0%, 2.5%, 5%, 10%, 20%, 30% and 50%wt). The worn surfaces after d…
View article: Tribology of vegetal oils as base for eco-friendly nano additivated lubricants
Tribology of vegetal oils as base for eco-friendly nano additivated lubricants Open
This paper presents an analysis based on experimental data for pointing out the behavior of rapeseed oil when it is additivated with a modifier of friction and wear, the nano hexagonal Boron nitride. All tests are done on a four-ball machi…
View article: The Behavior of Glass Fiber Composites under Low Velocity Impacts
The Behavior of Glass Fiber Composites under Low Velocity Impacts Open
This paper presents experimental results on the behavior of a class of glass fiber composites under low velocity impacts, in order to analyze their usage in designing low velocity impact-resistant components in car and marine industries. A…
View article: Simulation of an Impact on an Aramid Fabric Panel by A .357 Projectile
Simulation of an Impact on an Aramid Fabric Panel by A .357 Projectile Open
This paper presents a model for impact bullet – panel of woven aramid fabrics in order to use it for an initial assessment of similar panels to protect against bullets in a range of 100…800 m/s. Based on these initial simulations, the desi…
View article: Analyzing Impact Behaviour of Glass Fiber Epoxy Composites for Higher Safety Systems
Analyzing Impact Behaviour of Glass Fiber Epoxy Composites for Higher Safety Systems Open
This study investigates the impact behaviour of glass fiber epoxy composites with a focus on achieving enhanced safety. A drop weight impact test machine was used to perform a series of impact tests on the composite samples. Two different …
View article: The influence of introducing the cohesive zone model in simulating the impact of stratified composites
The influence of introducing the cohesive zone model in simulating the impact of stratified composites Open
This paper presents a comparison of two models for an impact with a projectile 9 mm FMJ (full metal jacket), having 373 m/s on stratified composites, at meso level. The models contain yarn with the geometry similar to the actual yarns of g…
View article: Ballistic Response of a Glass Fiber Composite for Two Levels of Threat
Ballistic Response of a Glass Fiber Composite for Two Levels of Threat Open
This paper presents the behavior of composite panels based on glass fiber unidirectional fabrics and a bi-component epoxy resin under ballistic impacts that characterize two threat levels: FB2 and FB3, according to EN 1523:2004. The tested…
View article: Simulation of the Behavior of 32-Layer Composite Plate for Ballistic Protection
Simulation of the Behavior of 32-Layer Composite Plate for Ballistic Protection Open
This paper presents experimental results and a failure analysis of a composite for ballistic protection. The stratified plate is manufactured at laboratory scale, after a technology designed by the authors. The plates were tested for level…
View article: Calculating the film thickness for the rapeseed oil in order to evaluate functioning regime
Calculating the film thickness for the rapeseed oil in order to evaluate functioning regime Open
The lubricating film, generated between two surfaces in relative motion, may have theoretical thicknesses between 10 -10 m and 10 -5 m. This paper presents a model for calculating the minimum film thickness depending on load, sliding speed…
View article: Laboratory scale technology for a ballistic protection panel and preliminary results
Laboratory scale technology for a ballistic protection panel and preliminary results Open
This paper presents a laboratory scale technology for manufacturing a composite with ballistic protection characteristics for a certain level of threat. The composite is made of quadriaxial fabrics, with four oriented substrates (0°/+45°/9…
View article: Failure simulation of stratified panel under ballistic impact
Failure simulation of stratified panel under ballistic impact Open
"This paper presents an analysis of an isothermal model for an impact simulation in order to use the results for virtually optimizing the thickness of the panel for the same threat. The target has a stratified structure; the connection bet…
View article: Mechanical Properties of Ultra-high Molecular Weight Polyethylene (tensylon�) from Tensile Tests
Mechanical Properties of Ultra-high Molecular Weight Polyethylene (tensylon�) from Tensile Tests Open
Results on mechanical properties of Tensylon� composites at room temperature are presented. Single-ply and two-ply samples, obtained from the ply-precursor sheet (of two orthogonal layers) have been subjected to: load till failure in tract…
View article: Bearings fault detection by means of frequency analysis
Bearings fault detection by means of frequency analysis Open
The present paper aims to analyse the possibility to prevent machine failure due to bearing faults, with the use of frequency analysis. The experimental research consisted in mounting a simple mechanical transmission, integrating an electr…
View article: Study regarding the influence of geometrical characteristics of the distribution system on truck engines efficiency parameters
Study regarding the influence of geometrical characteristics of the distribution system on truck engines efficiency parameters Open
The present paper aims to analyze the influence of certain parameters specific to the distribution systems on a truck engine performance. The research is focused on how the change in the shape of lobes of a camshaft can influence the vehic…
View article: Mechanical and tribological behaviour of PA6 and short aramid fiber composites
Mechanical and tribological behaviour of PA6 and short aramid fiber composites Open
This paper presents the results of mechanical and tribological characteristics for two composites: PA6 as matrix and 5% aramid whiskers as additive material and PA6 + 10% aramid whiskers, comparing them to those made of PA6 (polyamide 6). …